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sys/kern/subr_acl_nfs4.c
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1 /*- 2 * Copyright (c) 2008-2009 Edward Tomasz Napierała <trasz@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 /* 28 * ACL support routines specific to NFSv4 access control lists. These are 29 * utility routines for code common across file systems implementing NFSv4 30 * ACLs. 31 */ 32 33 #ifdef _KERNEL 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD: releng/8.4/sys/kern/subr_acl_nfs4.c 246463 2013-02-07 11:09:16Z pluknet $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mount.h> 40 #include <sys/priv.h> 41 #include <sys/vnode.h> 42 #include <sys/errno.h> 43 #include <sys/stat.h> 44 #include <sys/acl.h> 45 #else 46 #include <errno.h> 47 #include <assert.h> 48 #include <sys/acl.h> 49 #include <sys/stat.h> 50 #define KASSERT(a, b) assert(a) 51 #define CTASSERT(a) 52 #endif /* _KERNEL */ 53 54 #ifdef _KERNEL 55 56 static struct { 57 accmode_t accmode; 58 int mask; 59 } accmode2mask[] = {{VREAD, ACL_READ_DATA}, 60 {VWRITE, ACL_WRITE_DATA}, 61 {VAPPEND, ACL_APPEND_DATA}, 62 {VEXEC, ACL_EXECUTE}, 63 {VREAD_NAMED_ATTRS, ACL_READ_NAMED_ATTRS}, 64 {VWRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS}, 65 {VDELETE_CHILD, ACL_DELETE_CHILD}, 66 {VREAD_ATTRIBUTES, ACL_READ_ATTRIBUTES}, 67 {VWRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES}, 68 {VDELETE, ACL_DELETE}, 69 {VREAD_ACL, ACL_READ_ACL}, 70 {VWRITE_ACL, ACL_WRITE_ACL}, 71 {VWRITE_OWNER, ACL_WRITE_OWNER}, 72 {VSYNCHRONIZE, ACL_SYNCHRONIZE}, 73 {0, 0}}; 74 75 static int 76 _access_mask_from_accmode(accmode_t accmode) 77 { 78 int access_mask = 0, i; 79 80 for (i = 0; accmode2mask[i].accmode != 0; i++) { 81 if (accmode & accmode2mask[i].accmode) 82 access_mask |= accmode2mask[i].mask; 83 } 84 85 /* 86 * VAPPEND is just a modifier for VWRITE; if the caller asked 87 * for 'VAPPEND | VWRITE', we want to check for ACL_APPEND_DATA only. 88 */ 89 if (access_mask & ACL_APPEND_DATA) 90 access_mask &= ~ACL_WRITE_DATA; 91 92 return (access_mask); 93 } 94 95 /* 96 * Return 0, iff access is allowed, 1 otherwise. 97 */ 98 static int 99 _acl_denies(const struct acl *aclp, int access_mask, struct ucred *cred, 100 int file_uid, int file_gid, int *denied_explicitly) 101 { 102 int i; 103 const struct acl_entry *entry; 104 105 if (denied_explicitly != NULL) 106 *denied_explicitly = 0; 107 108 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 109 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 110 111 for (i = 0; i < aclp->acl_cnt; i++) { 112 entry = &(aclp->acl_entry[i]); 113 114 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 115 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 116 continue; 117 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 118 continue; 119 switch (entry->ae_tag) { 120 case ACL_USER_OBJ: 121 if (file_uid != cred->cr_uid) 122 continue; 123 break; 124 case ACL_USER: 125 if (entry->ae_id != cred->cr_uid) 126 continue; 127 break; 128 case ACL_GROUP_OBJ: 129 if (!groupmember(file_gid, cred)) 130 continue; 131 break; 132 case ACL_GROUP: 133 if (!groupmember(entry->ae_id, cred)) 134 continue; 135 break; 136 default: 137 KASSERT(entry->ae_tag == ACL_EVERYONE, 138 ("entry->ae_tag == ACL_EVERYONE")); 139 } 140 141 if (entry->ae_entry_type == ACL_ENTRY_TYPE_DENY) { 142 if (entry->ae_perm & access_mask) { 143 if (denied_explicitly != NULL) 144 *denied_explicitly = 1; 145 return (1); 146 } 147 } 148 149 access_mask &= ~(entry->ae_perm); 150 if (access_mask == 0) 151 return (0); 152 } 153 154 return (1); 155 } 156 157 int 158 vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid, 159 struct acl *aclp, accmode_t accmode, struct ucred *cred, int *privused) 160 { 161 accmode_t priv_granted = 0; 162 int denied, explicitly_denied, access_mask, is_directory, 163 must_be_owner = 0; 164 165 if (privused != NULL) 166 *privused = 0; 167 168 if (accmode & VADMIN) 169 must_be_owner = 1; 170 171 /* 172 * Ignore VSYNCHRONIZE permission. 173 */ 174 accmode &= ~VSYNCHRONIZE; 175 176 access_mask = _access_mask_from_accmode(accmode); 177 178 if (type == VDIR) 179 is_directory = 1; 180 else 181 is_directory = 0; 182 183 /* 184 * File owner is always allowed to read and write the ACL 185 * and basic attributes. This is to prevent a situation 186 * where user would change ACL in a way that prevents him 187 * from undoing the change. 188 */ 189 if (file_uid == cred->cr_uid) 190 access_mask &= ~(ACL_READ_ACL | ACL_WRITE_ACL | 191 ACL_READ_ATTRIBUTES | ACL_WRITE_ATTRIBUTES); 192 193 /* 194 * Ignore append permission for regular files; use write 195 * permission instead. 196 */ 197 if (!is_directory && (access_mask & ACL_APPEND_DATA)) { 198 access_mask &= ~ACL_APPEND_DATA; 199 access_mask |= ACL_WRITE_DATA; 200 } 201 202 denied = _acl_denies(aclp, access_mask, cred, file_uid, file_gid, 203 &explicitly_denied); 204 205 if (must_be_owner) { 206 if (file_uid != cred->cr_uid) 207 denied = EPERM; 208 } 209 210 if (!denied) 211 return (0); 212 213 /* 214 * Access failed. Iff it was not denied explicitly and 215 * VEXPLICIT_DENY flag was specified, allow access. 216 */ 217 if ((accmode & VEXPLICIT_DENY) && explicitly_denied == 0) 218 return (0); 219 220 accmode &= ~VEXPLICIT_DENY; 221 222 /* 223 * No match. Try to use privileges, if there are any. 224 */ 225 if (is_directory) { 226 if ((accmode & VEXEC) && !priv_check_cred(cred, 227 PRIV_VFS_LOOKUP, 0)) 228 priv_granted |= VEXEC; 229 } else { 230 if ((accmode & VEXEC) && !priv_check_cred(cred, 231 PRIV_VFS_EXEC, 0)) 232 priv_granted |= VEXEC; 233 } 234 235 if ((accmode & VREAD) && !priv_check_cred(cred, PRIV_VFS_READ, 0)) 236 priv_granted |= VREAD; 237 238 if ((accmode & (VWRITE | VAPPEND | VDELETE_CHILD)) && 239 !priv_check_cred(cred, PRIV_VFS_WRITE, 0)) 240 priv_granted |= (VWRITE | VAPPEND | VDELETE_CHILD); 241 242 if ((accmode & VADMIN_PERMS) && 243 !priv_check_cred(cred, PRIV_VFS_ADMIN, 0)) 244 priv_granted |= VADMIN_PERMS; 245 246 if ((accmode & VSTAT_PERMS) && 247 !priv_check_cred(cred, PRIV_VFS_STAT, 0)) 248 priv_granted |= VSTAT_PERMS; 249 250 if ((accmode & priv_granted) == accmode) { 251 if (privused != NULL) 252 *privused = 1; 253 254 return (0); 255 } 256 257 if (accmode & (VADMIN_PERMS | VDELETE_CHILD | VDELETE)) 258 denied = EPERM; 259 else 260 denied = EACCES; 261 262 return (denied); 263 } 264 #endif /* _KERNEL */ 265 266 static int 267 _acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm, 268 acl_entry_type_t entry_type) 269 { 270 if (entry->ae_tag != tag) 271 return (0); 272 273 if (entry->ae_id != ACL_UNDEFINED_ID) 274 return (0); 275 276 if (entry->ae_perm != perm) 277 return (0); 278 279 if (entry->ae_entry_type != entry_type) 280 return (0); 281 282 if (entry->ae_flags != 0) 283 return (0); 284 285 return (1); 286 } 287 288 static struct acl_entry * 289 _acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm, 290 acl_entry_type_t entry_type) 291 { 292 struct acl_entry *entry; 293 294 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 295 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 296 297 entry = &(aclp->acl_entry[aclp->acl_cnt]); 298 aclp->acl_cnt++; 299 300 entry->ae_tag = tag; 301 entry->ae_id = ACL_UNDEFINED_ID; 302 entry->ae_perm = perm; 303 entry->ae_entry_type = entry_type; 304 entry->ae_flags = 0; 305 306 return (entry); 307 } 308 309 static struct acl_entry * 310 _acl_duplicate_entry(struct acl *aclp, int entry_index) 311 { 312 int i; 313 314 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 315 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 316 317 for (i = aclp->acl_cnt; i > entry_index; i--) 318 aclp->acl_entry[i] = aclp->acl_entry[i - 1]; 319 320 aclp->acl_cnt++; 321 322 return (&(aclp->acl_entry[entry_index + 1])); 323 } 324 325 /* 326 * Calculate trivial ACL in a manner compatible with PSARC/2010/029. 327 * Note that this results in an ACL different from (but semantically 328 * equal to) the "canonical six" trivial ACL computed using algorithm 329 * described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2. 330 */ 331 void 332 acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode) 333 { 334 acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0; 335 acl_perm_t user_allow, group_allow, everyone_allow; 336 337 KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0")); 338 339 user_allow = group_allow = everyone_allow = ACL_READ_ACL | 340 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE; 341 user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 342 ACL_WRITE_NAMED_ATTRS; 343 344 if (mode & S_IRUSR) 345 user_allow |= ACL_READ_DATA; 346 if (mode & S_IWUSR) 347 user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 348 if (mode & S_IXUSR) 349 user_allow |= ACL_EXECUTE; 350 351 if (mode & S_IRGRP) 352 group_allow |= ACL_READ_DATA; 353 if (mode & S_IWGRP) 354 group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 355 if (mode & S_IXGRP) 356 group_allow |= ACL_EXECUTE; 357 358 if (mode & S_IROTH) 359 everyone_allow |= ACL_READ_DATA; 360 if (mode & S_IWOTH) 361 everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 362 if (mode & S_IXOTH) 363 everyone_allow |= ACL_EXECUTE; 364 365 user_deny = ((group_allow | everyone_allow) & ~user_allow); 366 group_deny = everyone_allow & ~group_allow; 367 user_allow_first = group_deny & ~user_deny; 368 369 if (user_allow_first != 0) 370 _acl_append(aclp, ACL_USER_OBJ, user_allow_first, ACL_ENTRY_TYPE_ALLOW); 371 if (user_deny != 0) 372 _acl_append(aclp, ACL_USER_OBJ, user_deny, ACL_ENTRY_TYPE_DENY); 373 if (group_deny != 0) 374 _acl_append(aclp, ACL_GROUP_OBJ, group_deny, ACL_ENTRY_TYPE_DENY); 375 _acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW); 376 _acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW); 377 _acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW); 378 } 379 380 void 381 acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, int file_owner_id) 382 { 383 int i, meets, must_append; 384 struct acl_entry *entry, *copy, *previous, 385 *a1, *a2, *a3, *a4, *a5, *a6; 386 mode_t amode; 387 const int READ = 04; 388 const int WRITE = 02; 389 const int EXEC = 01; 390 391 KASSERT(aclp->acl_cnt >= 0, ("aclp->acl_cnt >= 0")); 392 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 393 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 394 395 /* 396 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 397 * 398 * 3.16.6.3. Applying a Mode to an Existing ACL 399 */ 400 401 /* 402 * 1. For each ACE: 403 */ 404 for (i = 0; i < aclp->acl_cnt; i++) { 405 entry = &(aclp->acl_entry[i]); 406 407 /* 408 * 1.1. If the type is neither ALLOW or DENY - skip. 409 */ 410 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 411 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 412 continue; 413 414 /* 415 * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip. 416 */ 417 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 418 continue; 419 420 /* 421 * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT 422 * are set: 423 */ 424 if (entry->ae_flags & 425 (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) { 426 /* 427 * 1.3.1. A copy of the current ACE is made, and placed 428 * in the ACL immediately following the current 429 * ACE. 430 */ 431 copy = _acl_duplicate_entry(aclp, i); 432 433 /* 434 * 1.3.2. In the first ACE, the flag 435 * ACL_ENTRY_INHERIT_ONLY is set. 436 */ 437 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 438 439 /* 440 * 1.3.3. In the second ACE, the following flags 441 * are cleared: 442 * ACL_ENTRY_FILE_INHERIT, 443 * ACL_ENTRY_DIRECTORY_INHERIT, 444 * ACL_ENTRY_NO_PROPAGATE_INHERIT. 445 */ 446 copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT | 447 ACL_ENTRY_DIRECTORY_INHERIT | 448 ACL_ENTRY_NO_PROPAGATE_INHERIT); 449 450 /* 451 * The algorithm continues on with the second ACE. 452 */ 453 i++; 454 entry = copy; 455 } 456 457 /* 458 * 1.4. If it's owner@, group@ or everyone@ entry, clear 459 * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA 460 * and ACL_EXECUTE. Continue to the next entry. 461 */ 462 if (entry->ae_tag == ACL_USER_OBJ || 463 entry->ae_tag == ACL_GROUP_OBJ || 464 entry->ae_tag == ACL_EVERYONE) { 465 entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA | 466 ACL_APPEND_DATA | ACL_EXECUTE); 467 continue; 468 } 469 470 /* 471 * 1.5. Otherwise, if the "who" field did not match one 472 * of OWNER@, GROUP@, EVERYONE@: 473 * 474 * 1.5.1. If the type is ALLOW, check the preceding ACE. 475 * If it does not meet all of the following criteria: 476 */ 477 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW) 478 continue; 479 480 meets = 0; 481 if (i > 0) { 482 meets = 1; 483 previous = &(aclp->acl_entry[i - 1]); 484 485 /* 486 * 1.5.1.1. The type field is DENY, 487 */ 488 if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY) 489 meets = 0; 490 491 /* 492 * 1.5.1.2. The "who" field is the same as the current 493 * ACE, 494 * 495 * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP 496 * is the same as it is in the current ACE, 497 * and no other flag bits are set, 498 */ 499 if (previous->ae_id != entry->ae_id || 500 previous->ae_tag != entry->ae_tag) 501 meets = 0; 502 503 if (previous->ae_flags) 504 meets = 0; 505 506 /* 507 * 1.5.1.4. The mask bits are a subset of the mask bits 508 * of the current ACE, and are also subset of 509 * the following: ACL_READ_DATA, 510 * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE 511 */ 512 if (previous->ae_perm & ~(entry->ae_perm)) 513 meets = 0; 514 515 if (previous->ae_perm & ~(ACL_READ_DATA | 516 ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE)) 517 meets = 0; 518 } 519 520 if (!meets) { 521 /* 522 * Then the ACE of type DENY, with a who equal 523 * to the current ACE, flag bits equal to 524 * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>) 525 * and no mask bits, is prepended. 526 */ 527 previous = entry; 528 entry = _acl_duplicate_entry(aclp, i); 529 530 /* Adjust counter, as we've just added an entry. */ 531 i++; 532 533 previous->ae_tag = entry->ae_tag; 534 previous->ae_id = entry->ae_id; 535 previous->ae_flags = entry->ae_flags; 536 previous->ae_perm = 0; 537 previous->ae_entry_type = ACL_ENTRY_TYPE_DENY; 538 } 539 540 /* 541 * 1.5.2. The following modifications are made to the prepended 542 * ACE. The intent is to mask the following ACE 543 * to disallow ACL_READ_DATA, ACL_WRITE_DATA, 544 * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group 545 * permissions of the new mode. As a special case, 546 * if the ACE matches the current owner of the file, 547 * the owner bits are used, rather than the group bits. 548 * This is reflected in the algorithm below. 549 */ 550 amode = mode >> 3; 551 552 /* 553 * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field 554 * in ACE matches the owner of the file, we shift amode three 555 * more bits, in order to have the owner permission bits 556 * placed in the three low order bits of amode. 557 */ 558 if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id) 559 amode = amode >> 3; 560 561 if (entry->ae_perm & ACL_READ_DATA) { 562 if (amode & READ) 563 previous->ae_perm &= ~ACL_READ_DATA; 564 else 565 previous->ae_perm |= ACL_READ_DATA; 566 } 567 568 if (entry->ae_perm & ACL_WRITE_DATA) { 569 if (amode & WRITE) 570 previous->ae_perm &= ~ACL_WRITE_DATA; 571 else 572 previous->ae_perm |= ACL_WRITE_DATA; 573 } 574 575 if (entry->ae_perm & ACL_APPEND_DATA) { 576 if (amode & WRITE) 577 previous->ae_perm &= ~ACL_APPEND_DATA; 578 else 579 previous->ae_perm |= ACL_APPEND_DATA; 580 } 581 582 if (entry->ae_perm & ACL_EXECUTE) { 583 if (amode & EXEC) 584 previous->ae_perm &= ~ACL_EXECUTE; 585 else 586 previous->ae_perm |= ACL_EXECUTE; 587 } 588 589 /* 590 * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags 591 * of the ALLOW ace: 592 * 593 * XXX: This point is not there in the Falkner's draft. 594 */ 595 if (entry->ae_tag == ACL_GROUP && 596 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) { 597 mode_t extramode, ownermode; 598 extramode = (mode >> 3) & 07; 599 ownermode = mode >> 6; 600 extramode &= ~ownermode; 601 602 if (extramode) { 603 if (extramode & READ) { 604 entry->ae_perm &= ~ACL_READ_DATA; 605 previous->ae_perm &= ~ACL_READ_DATA; 606 } 607 608 if (extramode & WRITE) { 609 entry->ae_perm &= 610 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 611 previous->ae_perm &= 612 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 613 } 614 615 if (extramode & EXEC) { 616 entry->ae_perm &= ~ACL_EXECUTE; 617 previous->ae_perm &= ~ACL_EXECUTE; 618 } 619 } 620 } 621 } 622 623 /* 624 * 2. If there at least six ACEs, the final six ACEs are examined. 625 * If they are not equal to what we want, append six ACEs. 626 */ 627 must_append = 0; 628 if (aclp->acl_cnt < 6) { 629 must_append = 1; 630 } else { 631 a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]); 632 a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]); 633 a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]); 634 a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]); 635 a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]); 636 a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]); 637 638 if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0, 639 ACL_ENTRY_TYPE_DENY)) 640 must_append = 1; 641 if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL | 642 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 643 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW)) 644 must_append = 1; 645 if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0, 646 ACL_ENTRY_TYPE_DENY)) 647 must_append = 1; 648 if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0, 649 ACL_ENTRY_TYPE_ALLOW)) 650 must_append = 1; 651 if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL | 652 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 653 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY)) 654 must_append = 1; 655 if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL | 656 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 657 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW)) 658 must_append = 1; 659 } 660 661 if (must_append) { 662 KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES, 663 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 664 665 a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY); 666 a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL | 667 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 668 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW); 669 a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY); 670 a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW); 671 a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL | 672 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 673 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY); 674 a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL | 675 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 676 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW); 677 678 KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL && 679 a5 != NULL && a6 != NULL, ("couldn't append to ACL.")); 680 } 681 682 /* 683 * 3. The final six ACEs are adjusted according to the incoming mode. 684 */ 685 if (mode & S_IRUSR) 686 a2->ae_perm |= ACL_READ_DATA; 687 else 688 a1->ae_perm |= ACL_READ_DATA; 689 if (mode & S_IWUSR) 690 a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 691 else 692 a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 693 if (mode & S_IXUSR) 694 a2->ae_perm |= ACL_EXECUTE; 695 else 696 a1->ae_perm |= ACL_EXECUTE; 697 698 if (mode & S_IRGRP) 699 a4->ae_perm |= ACL_READ_DATA; 700 else 701 a3->ae_perm |= ACL_READ_DATA; 702 if (mode & S_IWGRP) 703 a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 704 else 705 a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 706 if (mode & S_IXGRP) 707 a4->ae_perm |= ACL_EXECUTE; 708 else 709 a3->ae_perm |= ACL_EXECUTE; 710 711 if (mode & S_IROTH) 712 a6->ae_perm |= ACL_READ_DATA; 713 else 714 a5->ae_perm |= ACL_READ_DATA; 715 if (mode & S_IWOTH) 716 a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 717 else 718 a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 719 if (mode & S_IXOTH) 720 a6->ae_perm |= ACL_EXECUTE; 721 else 722 a5->ae_perm |= ACL_EXECUTE; 723 } 724 725 void 726 acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp) 727 { 728 int i; 729 mode_t old_mode = *_mode, mode = 0, seen = 0; 730 const struct acl_entry *entry; 731 732 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 733 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 734 735 /* 736 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 737 * 738 * 3.16.6.1. Recomputing mode upon SETATTR of ACL 739 */ 740 741 for (i = 0; i < aclp->acl_cnt; i++) { 742 entry = &(aclp->acl_entry[i]); 743 744 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 745 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 746 continue; 747 748 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 749 continue; 750 751 if (entry->ae_tag == ACL_USER_OBJ) { 752 if ((entry->ae_perm & ACL_READ_DATA) && 753 ((seen & S_IRUSR) == 0)) { 754 seen |= S_IRUSR; 755 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 756 mode |= S_IRUSR; 757 } 758 if ((entry->ae_perm & ACL_WRITE_DATA) && 759 ((seen & S_IWUSR) == 0)) { 760 seen |= S_IWUSR; 761 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 762 mode |= S_IWUSR; 763 } 764 if ((entry->ae_perm & ACL_EXECUTE) && 765 ((seen & S_IXUSR) == 0)) { 766 seen |= S_IXUSR; 767 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 768 mode |= S_IXUSR; 769 } 770 } else if (entry->ae_tag == ACL_GROUP_OBJ) { 771 if ((entry->ae_perm & ACL_READ_DATA) && 772 ((seen & S_IRGRP) == 0)) { 773 seen |= S_IRGRP; 774 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 775 mode |= S_IRGRP; 776 } 777 if ((entry->ae_perm & ACL_WRITE_DATA) && 778 ((seen & S_IWGRP) == 0)) { 779 seen |= S_IWGRP; 780 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 781 mode |= S_IWGRP; 782 } 783 if ((entry->ae_perm & ACL_EXECUTE) && 784 ((seen & S_IXGRP) == 0)) { 785 seen |= S_IXGRP; 786 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 787 mode |= S_IXGRP; 788 } 789 } else if (entry->ae_tag == ACL_EVERYONE) { 790 if (entry->ae_perm & ACL_READ_DATA) { 791 if ((seen & S_IRUSR) == 0) { 792 seen |= S_IRUSR; 793 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 794 mode |= S_IRUSR; 795 } 796 if ((seen & S_IRGRP) == 0) { 797 seen |= S_IRGRP; 798 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 799 mode |= S_IRGRP; 800 } 801 if ((seen & S_IROTH) == 0) { 802 seen |= S_IROTH; 803 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 804 mode |= S_IROTH; 805 } 806 } 807 if (entry->ae_perm & ACL_WRITE_DATA) { 808 if ((seen & S_IWUSR) == 0) { 809 seen |= S_IWUSR; 810 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 811 mode |= S_IWUSR; 812 } 813 if ((seen & S_IWGRP) == 0) { 814 seen |= S_IWGRP; 815 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 816 mode |= S_IWGRP; 817 } 818 if ((seen & S_IWOTH) == 0) { 819 seen |= S_IWOTH; 820 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 821 mode |= S_IWOTH; 822 } 823 } 824 if (entry->ae_perm & ACL_EXECUTE) { 825 if ((seen & S_IXUSR) == 0) { 826 seen |= S_IXUSR; 827 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 828 mode |= S_IXUSR; 829 } 830 if ((seen & S_IXGRP) == 0) { 831 seen |= S_IXGRP; 832 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 833 mode |= S_IXGRP; 834 } 835 if ((seen & S_IXOTH) == 0) { 836 seen |= S_IXOTH; 837 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 838 mode |= S_IXOTH; 839 } 840 } 841 } 842 } 843 844 *_mode = mode | (old_mode & ACL_PRESERVE_MASK); 845 } 846 847 void 848 acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp, 849 struct acl *child_aclp, mode_t mode, int file_owner_id, 850 int is_directory) 851 { 852 int i, flags; 853 const struct acl_entry *parent_entry; 854 struct acl_entry *entry, *copy; 855 856 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0")); 857 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 858 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 859 860 /* 861 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 862 * 863 * 3.16.6.2. Applying the mode given to CREATE or OPEN 864 * to an inherited ACL 865 */ 866 867 /* 868 * 1. Form an ACL that is the concatenation of all inheritable ACEs. 869 */ 870 for (i = 0; i < parent_aclp->acl_cnt; i++) { 871 parent_entry = &(parent_aclp->acl_entry[i]); 872 flags = parent_entry->ae_flags; 873 874 /* 875 * Entry is not inheritable at all. 876 */ 877 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 878 ACL_ENTRY_FILE_INHERIT)) == 0) 879 continue; 880 881 /* 882 * We're creating a file, but entry is not inheritable 883 * by files. 884 */ 885 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 886 continue; 887 888 /* 889 * Entry is inheritable only by files, but has NO_PROPAGATE 890 * flag set, and we're creating a directory, so it wouldn't 891 * propagate to any file in that directory anyway. 892 */ 893 if (is_directory && 894 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 895 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 896 continue; 897 898 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 899 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 900 child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry; 901 child_aclp->acl_cnt++; 902 } 903 904 /* 905 * 2. For each entry in the new ACL, adjust its flags, possibly 906 * creating two entries in place of one. 907 */ 908 for (i = 0; i < child_aclp->acl_cnt; i++) { 909 entry = &(child_aclp->acl_entry[i]); 910 911 /* 912 * This is not in the specification, but SunOS 913 * apparently does that. 914 */ 915 if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) || 916 !is_directory) && 917 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 918 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 919 920 /* 921 * 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object 922 * being created is not a directory, then clear the 923 * following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 924 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 925 * ACL_ENTRY_INHERIT_ONLY. 926 */ 927 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 928 !is_directory) { 929 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 930 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 931 ACL_ENTRY_INHERIT_ONLY); 932 933 /* 934 * Continue on to the next ACE. 935 */ 936 continue; 937 } 938 939 /* 940 * 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT 941 * is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure 942 * that ACL_ENTRY_INHERIT_ONLY is set. Continue to the 943 * next ACE. Otherwise... 944 */ 945 /* 946 * XXX: Read it again and make sure what does the "otherwise" 947 * apply to. 948 */ 949 if (is_directory && 950 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 951 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 952 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 953 continue; 954 } 955 956 /* 957 * 2.C. If the type of the ACE is neither ALLOW nor deny, 958 * then continue. 959 */ 960 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 961 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 962 continue; 963 964 /* 965 * 2.D. Copy the original ACE into a second, adjacent ACE. 966 */ 967 copy = _acl_duplicate_entry(child_aclp, i); 968 969 /* 970 * 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY 971 * is set. 972 */ 973 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 974 975 /* 976 * 2.F. On the second ACE, clear the following flags: 977 * ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT, 978 * ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY. 979 */ 980 copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 981 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 982 ACL_ENTRY_INHERIT_ONLY); 983 984 /* 985 * 2.G. On the second ACE, if the type is ALLOW, 986 * an implementation MAY clear the following 987 * mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER. 988 */ 989 if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 990 copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 991 992 /* 993 * Increment the counter to skip the copied entry. 994 */ 995 i++; 996 } 997 998 /* 999 * 3. To ensure that the mode is honored, apply the algorithm describe 1000 * in Section 2.16.6.3, using the mode that is to be used for file 1001 * creation. 1002 */ 1003 acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id); 1004 } 1005 1006 #ifdef _KERNEL 1007 static int 1008 _acls_are_equal(const struct acl *a, const struct acl *b) 1009 { 1010 int i; 1011 const struct acl_entry *entrya, *entryb; 1012 1013 if (a->acl_cnt != b->acl_cnt) 1014 return (0); 1015 1016 for (i = 0; i < b->acl_cnt; i++) { 1017 entrya = &(a->acl_entry[i]); 1018 entryb = &(b->acl_entry[i]); 1019 1020 if (entrya->ae_tag != entryb->ae_tag || 1021 entrya->ae_id != entryb->ae_id || 1022 entrya->ae_perm != entryb->ae_perm || 1023 entrya->ae_entry_type != entryb->ae_entry_type || 1024 entrya->ae_flags != entryb->ae_flags) 1025 return (0); 1026 } 1027 1028 return (1); 1029 } 1030 1031 /* 1032 * This routine is used to determine whether to remove entry_type attribute 1033 * that stores ACL contents. 1034 */ 1035 int 1036 acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id) 1037 { 1038 int trivial; 1039 mode_t tmpmode = 0; 1040 struct acl *tmpaclp; 1041 1042 if (aclp->acl_cnt != 6) 1043 return (0); 1044 1045 /* 1046 * Compute the mode from the ACL, then compute new ACL from that mode. 1047 * If the ACLs are identical, then the ACL is trivial. 1048 * 1049 * XXX: I guess there is a faster way to do this. However, even 1050 * this slow implementation significantly speeds things up 1051 * for files that don't have any entry_type ACL entries - it's 1052 * critical for performance to not use EA when they are not 1053 * needed. 1054 */ 1055 tmpaclp = acl_alloc(M_WAITOK | M_ZERO); 1056 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp); 1057 acl_nfs4_sync_acl_from_mode(tmpaclp, tmpmode, file_owner_id); 1058 trivial = _acls_are_equal(aclp, tmpaclp); 1059 acl_free(tmpaclp); 1060 1061 return (trivial); 1062 } 1063 #endif /* _KERNEL */ 1064 1065 int 1066 acl_nfs4_check(const struct acl *aclp, int is_directory) 1067 { 1068 int i; 1069 const struct acl_entry *entry; 1070 1071 /* 1072 * The spec doesn't seem to say anything about ACL validity. 1073 * It seems there is not much to do here. There is even no need 1074 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE) 1075 * entries, as there can be several of them and that's perfectly 1076 * valid. There can be none of them too. Really. 1077 */ 1078 1079 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0) 1080 return (EINVAL); 1081 1082 for (i = 0; i < aclp->acl_cnt; i++) { 1083 entry = &(aclp->acl_entry[i]); 1084 1085 switch (entry->ae_tag) { 1086 case ACL_USER_OBJ: 1087 case ACL_GROUP_OBJ: 1088 case ACL_EVERYONE: 1089 if (entry->ae_id != ACL_UNDEFINED_ID) 1090 return (EINVAL); 1091 break; 1092 1093 case ACL_USER: 1094 case ACL_GROUP: 1095 if (entry->ae_id == ACL_UNDEFINED_ID) 1096 return (EINVAL); 1097 break; 1098 1099 default: 1100 return (EINVAL); 1101 } 1102 1103 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS) 1104 return (EINVAL); 1105 1106 /* 1107 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now. 1108 */ 1109 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1110 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1111 return (EINVAL); 1112 1113 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS) 1114 return (EINVAL); 1115 1116 /* Disallow unimplemented flags. */ 1117 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS | 1118 ACL_ENTRY_FAILED_ACCESS)) 1119 return (EINVAL); 1120 1121 /* Disallow flags not allowed for ordinary files. */ 1122 if (!is_directory) { 1123 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT | 1124 ACL_ENTRY_DIRECTORY_INHERIT | 1125 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY)) 1126 return (EINVAL); 1127 } 1128 } 1129 1130 return (0); 1131 }
Cache object: 5e8f31a5c471c16ab59cc3731dc0219b
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